Concrete-mixer.



Y PLTENTED JULY l2 m04; E! CAMPBELL.

CONCRETE MIXER. APPLIGATIOH @uhmm 1,1903;

Hummm-amm 1.

No YMODEL.

PATIENT@ JULYV 12, 1904,

` 4 SHBBTS-SHEBT .m mx ET.. BM P mm GR .m HO `nu W. uw 4 6. .nl m,

IMPLgmAT1013 FILED JUNE 1, lsmfs Bg -y/@W/ @MM/7g2 PATFNTED JULY 12',1904;'

wb. 75mm.

HQ GAMPBBLL.. @MUERTE MIXER.

PLIATIN FILED JUNEL, `1903.

M o o 4 No; 764,557. PATBNTED JULY 12, 1904.

H. CAMPBELL.

CONCRETE MIXER'. l.APPLIGATIION FILED .TUNE 1. 190B.

Patented Joly 1a',

N UNITED STATE-s `PATEN'r"-' OFFICE@ To all whom it may concern: f-` *Beit known that I, HENRY CAMPBELL, a citi- HENRY' SPECIFIQATIQN formingpartei Letters Patent No 764,557, dfed 04.9 f 'y Application filed une1.903. Serial No.v 159,019. (No model.)

" zen ofthe United States, residing in the city of Clucagmcounty ofCook, and State oi' Illinois7 vhave .invented new and 4usefulImprovement 1inConcreteMixers, of which the following is a lof'concrete;"and the objects of my invention @specification Myinventionirelates-to concretemixers wherein cement, f crushed stone, andsand `are commingled and moistened for the production i are, first, toprovide convenient and eliicient meansfforintroducing the ingredientsinto the vdrumysecond, to provide means for controlling the proportionlof thedifferent ingredients .enteringinto the drum; third` to provide ymeans for obtaining an intimate mixture and of? construction hereinaftermore fully set forth -I- obtain these objects the mechanism illnstratedin the .accompanying drawings, :3in1 which-a i j )Figure 1 isaplan'viewof the complete mai chine. Fig. 2 is a side view thereof with theexception ot' the storage-bins. Fig. 3 is averfticallongitudinalfsection o't thev drum, showingthe helicalconveyor-flights and the pickups@ lThe view is taken looking inthedirection ofthe arrowson the line 3. 3, Fig. 6. Fig. 4 is anendview ofthe drum and gearinglooking in the direction of the arrow, Fig.

1 i is alsoshown..`` Eig. l5 is .an end view 'of the 2. Thelowerextremity of Athe storage-bins i' dr/nm looking `in the directionopposite tothe .,arrovv, Fig. 2. Fig. 6 is a sectional view of `thedrum, taken yon the line 6 6, Fig. 3. Tins iignre shoWsthe trough -and-.the bucketsi. .whereby `material .is transferredi'rom the trough to theinteriorothe drum. Fig. lis

'r a .transverse Vsectional viewo, the drum', taken onthelineig. 3.,seas to illistrate the GQltrnction ofthepiok-nps. y, 8 and, 9v

are face and edge'views, respectiveiy,of a

. octioi'iofv totnreyer.ilight,H In' said Fig. 9 the ilight isshownintheilatrthatis to,say the i f condition ,priortoblgbont into andsectionalvie-ws, respectively, showing.

ley d3. The discharge"fendr of MPBELL, or carence, ILLiNorsiAssIeNongoir`ONE-Hannajo EDWARD o. MARSH, or JACKSON, nineteen-1 `"v 10-is a detailview'irolnuthe side,1showirig `5o the discharge-chute at thedisehargeend-bf the drum. Fig. 11 is a'view ofV saiddischargechutelooking in the directionvofthearrow; Fig. 10. Fig. 12 is a taceview-ot`tbeiouterm extremity of on'e'othebnclnetsm Figl isza 55 .view 0i' thebuchen-taken on the# line 1313',

Fig. 12.. Figs. 11.1L audl are edgeanditaee views, respeotivel y, of areducer forithewbuckets 4 to be placed at the receivingaperturesdtrthez;

drum to regulate the amountzofefsmaterialien? 60 tering thereinto.Figs.; liwandwlaret modified form of reducen. 1 i Y .1 Similar lettersrefer to similar parte throng -g outthe several views'. 1 v 65 The drumo consists i of a cylinder, preterf I `ably of sheet metaland,arranged-sabbatits central axis is approximately horizontal, Thedrumhead b forms a closureforv theirveeeiving;

end of thedrum andfbyh preferenceis cast. t', 7o

a piece with the spur-gaard" and,.l'iollowjo1111,',-`

-nal-bearing b2. The flange bgisproviddjqr riveting the head to the,shell. of theldr Inj The framework c carries apillovvgbtlook, cpillow-block cap c2, wherein the journal.' Zhas `7i a bearing.Saidspurgear is driven oi the spunpinion d, mountedfomthe""short shaftd', saidshaft being;` jonrnaled-in bearings 0252.612, driven .by meansbtheA closed by means of the bead. @,'which b flange e' for riveting'totheshella oi the ilriiW and also a circular track which is sup" rtefdby the rollers e3 e3.. Saidrollers ares'npp cl on suitable jackshaftsmounted in thebea e* on the framework oflthemachin conveyor-nights fare"for convenience made Vin section, as illustrated inlljligs'. 3, aresecured within .the 'drum da, bylnieans of the knees or lugsf.`Said,liightsfareh lic .in form andby preferencethere are thre pletesetsV of ili'ghts'inth'e `drinn", .sitl that said iligh'tswill have apitch three times fasgreat nights `pr@faintly extend the' entireiegenLef three sets of buckets /tatherc being,by preference, three buckets ineach set, with each bucket 1n the set circumferentially equidistant forexample, ten inches-at the discharge end of thedrum.

Inaddition to the conveyer-tlights the drum is'provided with a series ofanglepick-ups g, pitched at an angle of approximately sixty degrees witha line tangent to the shell of the drum. Said pick-ups are riveted tothe shell and extend lengthwise thereof and are located between thedischarge end ofthe shell and the point of location of thereceiving-buckets.

1iNear the receiving end of the drum are from the other two. Thepeculiar configuration of said buckets is best shown in Figs. 6,

- 12, 13, wherein /i' represents the flange wherebut to act as a guardor trap to prevent the by they are secured in position upon the drum atthe apertures c' in said drum. /f'represents Scrapers which are locatedoutside of thedrum and serve to gather up and carry material from thetrough t', hereinafter referred to. Said Scrapers are approximatelycylindrical and concentric with the axis of the drum. Leading from saidScrapers to the drum and extending at an oblique angle to a tangentdrawn to the drum at the point of location of the vbuckets is thebucket-bottom h3. which connects with 'and is preferably integral withthe vThe object of the chute portion It* of thebucket is not only toguide the material into the d rum,

unwarranted escape of material from the drum when any given bucket 1s ator near a temporarily low portion of the drum. This fact E willbeapparent by referring to Fig. 6 of the drawings, wherein it is obviousthat material entering into the bucket temporarily at the top of thedrum is prevented from escaping f through the bucket temporarily at the.left of the drum and is similarly prevented from escaping through thebucket atv the bottom of L The buckets are provided with j the drum.sides for preventing material from escaping laterally.

1n order to strengthen the construction, the

webs it" are provided, which extend from the flange i' to the bottom ofthe bucket.

Another purpose served by the inwardlyextending portions of the bucketsis to prei ventmaterial lying at the bottom of the drum from overflowinginto the bucket-openings, and thus escaping from the drum. To insure theretention of the material, it is only neces l a and located in suchposition yas to lie close f to but not interfere with the Scrapers i.2of

the buckets Said troughs are supported on the framework of c and connectwith and rcl ceivc material from the storage-bins jjj. At the chutesformed at the lower extremity of i said bins are bin-gates f for thepurpose of shutting ofi' or otherwise controlling the supf ply ofmaterial. AIn the preferred construction said bins pitch downward towardsaid troughs z', so as todeliver material thereinto,

bin. In the form, of machine here shown the g central bin is thesmallest and adapted to conone nearest the drumhead 7; lis adapted tocontain sand and the one farthest from the said drumhead 7; is adaptedto contain stone. It is desirable that the buckets at the bottom of thestone-bin have a capacity approximately twice as great as the capacityof the other y buckets. By preference said bin-gates j' are lconstructed to slide in the guides L, located at the side of thebin-chutes. In order to set the gates in an open or closed position, asetscrew l." is provided, which is mounted in the cross-beam f2 in themanner best shown in Fig. 4.

At the discharge end of the drum is located a discharge-chute m, carriedon the bracket m", bolted to a suit-able cross-timber of the framework.The upper end of said chute normally lies withinthe drum, while thelower edge thereof lies outside of said drum in position to dischargeinto a barrow or'other suitable receptacle. In order that material maynot be discharged from said chute at times when there is no receptaclein readiness, said l its bracket, 'so that the outer extremity may Q bethrown upward. By making the inner end heavier thereis a tendency forthechute to rotate t'o a position in which it will not dis- L charge thecontents of the drum. In order to hold the chute inoperative position, ahook m2 is provided, as shown in Fig.` l0.

The necessary water for mixing the concrete pipe n, which is supportedat one end upon the bracket nf. Said pipe is connected with Iv anysuitable source of supply and is preferably provided with a valve n2 forcontrolling the flow ot' water. Said pipe passes into the drum throughthe hollow journal b2, and preferably terminates at its furtherextremity and a separate trough is provided for eachA tainfcement, whileof the two outer bins thel chute is in its best form pivotally hung upony is introduced within the drum through the IOO g with an eccentricreducer r1.3. which is screwed v into the pipe n?, supported in thebracket if. e Said pipe if is plugged in a suitable manner, and thebottom of the pipe 'n is perforated to discharge water onto the materialunder treatment. The perforations in said pipe are preferably located.one-third of the distance from l the innermost bucket toward thedischarge l end of the drum.

In operation the sand, cement, and stone are introduced in theirrespective bins and the bin-gates j are opened up such an amount i aswill supply the requisite quantity of materotated@ quentlygather thematerialtin said, troughsthe upper portion of the drum.

' and complete.

Lnel in theresptre neuste vos, sw

had" "stammered wat site m arrow, Fig. '6g-and the buckets LJvvilllconse? As a bucket'rises, due to tlie rotation `of the drum, thematerial will at first rest upon the scraper liz; but gradu`ally, as'thebucket rises, the materialwill slide along the chute 7a4 and be droppedinto the drum'. .This .dropping action* continues` throughout avconsiderable are at the top of the drum, thus assisting in effectingthorough mixture." Vinasmuch as the sand and cement are nearest thedrumhead they will be well mixed before coming into contact with thestone. As the drum con tinues'to revolve the iiights f will force thematerial toward the discharge end of the drum, and as soon as saidmaterial has passed beyond the buckets 7L said material will be engagedby the pick-ups g, and thereby lifted to The material will thus again bedropped into the iiights .and pickups, and this action of lifting' anddropping the material will be repeated. over and over until thedischarge end ofthe drum is reached, when the mixture will be thoroughIt Will be evident that during the process of picking up there isagatheriug together of'the material into small masses, and ,as thesemasses are dropped they are distributed over a considerable area at thebot tom of the drum, thus bringing particles into `contact `with otherparticles previously re- Anote', and thereby producing a thoroughlymixed and homogeneous product. At the discharge end of the drum thematerial instead of dropping into the 'flights below will drop into thedischarge-chute fm, and be by it delivered into a barrow or otherreceptacle. inasmuch as the liights do not extend com-- fpletely to thedischarge end of the drum, and

inasmuch as. the head e forms a partial closure for the discharge end ofthe d rum, material will collect in said drum at the discharge endthereof when the chute 11i/is not in operative position. Consequently byreleasing said chute and permitting the inner end there 4of to dropdownward material .is not discharged, but is collected just inside ofthe head c. As soon, however, as the chute m. is .again thrown tooperative position the material will be discharged in the usual manner.The advantage in this construction is that `it is not necessary to stopthe drum in order to stop the discharge of material therefrom.Consequently the drum may be continuous in its mixing action; but thedischarge of material may be discontinued for short intervals of timewithout detriment.

The i best method for reglllating the amount means of the reducers o,(Shown separately dish-shaped, l.as shown, and when bolted in 4positionupon the bottom of the buckets in the i 15.) Y These are -pref erabl-ymanner illustrated in Fig. 13 constitute a false bottom, which reducesthe amountwhich the buckets will retain. v By thus reducing the ca- 7pacity of one or more ofthe buckets of any set the proportion ofmaterial entering 'through that set of buckets may be regulated.

In Figs. 16 and 17 shutsoii blanks p are shown. 1n using these one ormore of. the

Abuckets It' are removed from the drum and the blanks substituted. Bysubstituting a shut-oflblank for all of thev buckets of anycircumferential set no material. will enter there, and the machine maythus be made to l operate upon two kinds of material only. It is obviousalso that fouror more sets of buck# ets side by side may be employedwithout ex-k ceeding the spirit of my invention.

What I claim as new, andglesire to secure by Letters Patent, is- "Y 1.In a concrete-mixer, the combination of a rotating drum and a pluralityof sets of bucka ets along said drum for introducing materiai thereinto,there beinga plurality of buckets in each of raid sets, and the bucketsof each set being arranged at diii'erent pointson the circumference ofsaid drum. A

2., `'ln a concrete-mixer, the combination of a rotating drum; aplurality of sets of buck# ets on said drum for' introducing materialthereinto, there being a plurality of buckets trough for each of saidsets of buckets for supplying' materiai thereto.`

3. luamiXingsmaehinerthe combination of a d ruin having an aperture inthe side thereof and a bucket secured to said drum at said apen ture,said bucket having a scraper located ont side of the :lru` m forgathering' materiai, and means for conveying material from the scraperinto the drumf v y fi. -in a mixing-niacinne, the combination of a drumhaving a plurality of apertures at dif@ ferent points in' thecirem'nference thereof., and a bucket at each of said apertures, saidbuckets having chutes which extend into'the drum, thereby forming a trapor guard for` preventing the unwarranted escape of the ma teriai fromthe drum.

in a mixing-.machina the combination of an znjiertured revolving drum,and a bucket for introducing material thereinto, said bucket comprisingmeans outside oi. the dren-i for introducing material into the drum'andachete within the said drum for preventing .the escape of material threugh said. bucket, when the same is revolved to a low point.

(i. in a mi xing-machine,` the combination o I IQ comprising a scraperfor gathering material,

taining material when at a low revolved position, and a chute inside ofthe drum and connecting with said bucket-bottom for the purposedescribed.` Y

7 In a concrete-mixer, the combination of a rotating drum having anaperture in the side thereof, a bucket secured to the drum at saidaperture, a scraper forming a part of said bucket'and located outside ofthe drum for gathering material, a bottom, as ta, also forming a part ofsaid bucket, and means for conveying' material from said scraper andbucketbottom into said drum.

8. In a concrete-mixer, the combination of a rotating' mixing-drumadapted to receive material at one end and discharge it at the other endthereof; means in said drum for conveying the material lengthwisetherein; pick- Y ups at the dischargeportion of the drum; said drumhaving apertures at the receiving por? tion thereof; and a plurality ofsets of projecting buckets on said drum at the said apertures therein,the buckets of each set being arranged at different points .on thecircurn ference of said drum.

' 9L In aconcrete-mixer, the combination of a rotating mixing-drum,having apertures in the sides thereof, helicaliights Within said drumfor dividing and separating the material as it falls to the bottom ofthe drum; and buckets secured to the 'sides of the drum at the aperturestherein, said buckets projecting outwardly from the sides of the drumand having Scrapers and chutes whereby the material is introduced intosaid drum from the `top thereof when said drum is rotated.

10. In a mixing-machine, the combination of la rotating drum having anaperture in the side thereof, means therein for moving material towardthe discharge end of the drum, a discharge-chutewat the discharge end ofs'aid drum, means in said drum for elevating material onto saiddischarge-chute, and abucket secured to the drum at the said aperturetherein, said bucket having a scraper located outside of the drum forgathering material and said bucket also having means for conveyingmaterial from the scraper thereof into the drum.

l1. In a concrete-mixer, the combination of a rotating drum; .aplurality of sets of buckets arranged along said drum forintroducingrnaterial thereinto, there being a plurality of buckets ineach of said sets, and the buckets on the circumference of said drum,and each of said buckets having a bottom and sides for retaining thematerial to be introduced into said drum; and reducers forming falsebottoms to said buckets to thereby reduce the capacity thereof,substantially as described.

12. In a concrete-mixer, the combination of a rotating drum havingapertures therein;` a

plurality of sets of removable bucketsar--. 65

be secured upon the drum at any of the aper.- tures thereimwhen therespective bucketlis V75 removed.

' HENRY CAMPBELL. Witnesses HOWARD-M. Cox,

G'rro J. WEIL.

sel

of each set being arranged at different 'points

